52 lines
1.8 KiB
Text
52 lines
1.8 KiB
Text
# Reads and returns a complete file as a string
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var readfile = func(file) {
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if((var st = stat(file)) == nil) die("Cannot stat file: " ~ file);
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var sz = st[7];
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var buf = bits.buf(sz);
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read(open(file), buf, sz);
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return buf;
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}
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# Generates a stat() test routine that is passed the "mode" field
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# (stat(...)[2]) from a stat() call (index 2), extracts the IFMT
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# subfield and compares it with the given type, assumes S_IFMT ==
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# 0xf000.
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var _gen_ifmt_test = func(ifmt) {
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func(stat_mode) {
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var buf = bits.buf(2);
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bits.setfld(buf, 0, 16, stat_mode);
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return ifmt == bits.fld(buf, 12, 4);
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}
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}
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# Generate file type test predicates isdir(), isreg(), islnk(), etc.
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# Usage: var s = io.stat(filename); # nil -> doesn't exist, broken link
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# if (s != nil and io.isdir(s[2])) { ... }
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var ifmts = {dir:4, reg:8, lnk:10, sock:12, fifo:1, blk:6, chr:2};
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foreach(fmt; keys(ifmts))
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caller(0)[0]["is" ~ fmt] = _gen_ifmt_test(ifmts[fmt]);
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# Removes superfluous slashes, emtpy and "." elements, expands
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# all ".." elements, and turns all backslashes into slashes.
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# The result will start with a slash if it started with a slash
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# or backslash, it will end without slash. Should be applied on
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# absolute paths, otherwise ".." elements might be resolved wrongly.
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var fixpath = func(path) {
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var d = "";
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for(var i = 0; i < size(path); i += 1) {
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if(path[i] == `\\`) d ~= "/";
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else d ~= chr(path[i]);
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}
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var prefix = path[0] == `/` ? "/" : "";
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var stack = [];
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foreach(var e; split("/", d)) {
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if(e == "." or e == "") continue;
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elsif(e == "..") pop(stack);
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else append(stack, e);
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}
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if(!size(stack)) return "/";
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path = stack[0];
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foreach(var s; subvec(stack, 1)) path ~= "/" ~ s;
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return prefix ~ path;
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}
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